Anderzander Posted February 27, 2018 Share Posted February 27, 2018 Are the old military Cav Ammeters, which I think are 24v, alright to use on a 12v set up? With my Series 1 being converted to alternator it will put out a lot more than the 30amp ammeter has - I want something period looking and there are quite a few Cav 100amp units about, but I don’t know if they only work in a 24v system.... I’m thinking that Ohms law means it won’t ? As the current is proportional to the voltage? Quote Link to comment Share on other sites More sharing options...
rtbarton Posted February 27, 2018 Share Posted February 27, 2018 Ammeters aren't sensitive to voltage, they're wired in series with supply & load, so you'll be OK Quote Link to comment Share on other sites More sharing options...
Anderzander Posted February 27, 2018 Author Share Posted February 27, 2018 That’s fantastic news - thank you ! Quote Link to comment Share on other sites More sharing options...
AV8R Posted February 28, 2018 Share Posted February 28, 2018 As long as your new alternator has a lower output as your ammeter will allow, you'll be okay. So in your case the alternator output should be less than 100 Amp. 1 Quote Link to comment Share on other sites More sharing options...
Anderzander Posted February 28, 2018 Author Share Posted February 28, 2018 65amp - so the needle should be in that comforting position of just past the middle 😊 Quote Link to comment Share on other sites More sharing options...
rtbarton Posted February 28, 2018 Share Posted February 28, 2018 Is it a centre-zero ammeter? Quote Link to comment Share on other sites More sharing options...
Anderzander Posted February 28, 2018 Author Share Posted February 28, 2018 No 0 - 100 left to right Quote Link to comment Share on other sites More sharing options...
rtbarton Posted February 28, 2018 Share Posted February 28, 2018 OK, just use it to measure ammeter output and not the usual thing of measuring battery charge/discharge current. Quote Link to comment Share on other sites More sharing options...
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